Team:Kyoto/GSDD/Introduction

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Introduction

Motivation

In genetic engineering, biologists design gene circuits as means to solve their facing problems such as medical problems, environmental problems, food problems, energy problems etc. Then they suppose future implement like injection into human blood stream, scatter across natural environment and something like these. But in many cases those designed cells repeat self reproduction several times and increase its number in the environment. And then sometimes they got unexpected internal errors into their genes, show us unexpected behavior and cause serious problems to its scattering environment. This is one of the most serious problems we biological engineers have to spend sincere efforts by considering every possibility and prevent them happen. But it is quite difficult to propose the effective solution in many cases.

Many biologists try to prevent them by using other gene circuits, intending cells population to be regulated by negative feedback loop and then, as a result, they cannot increase its number unlimitedly. But those indirect regulations using other gene circuits are difficult to tune up the parameters to each gene circuit and living environment. (Roughly to say, it is very messy.) So we hope a flexible method to control transformed cell’s behavior without using those obstinate gene regulations.